Mathematics for IGCSE & O level - Equations (Section 3 - No. 2)
In the context of the quadratic formula, why is the ± symbol important?
It provides the sum of the roots.
It provides the product of the roots.
It gives you two separate solutions for the equation.
It determines the y-intercept of the quadratic equation.
Giải thích
It indicates that you need to perform both addition and subtraction to find the two possible solutions.